Carriage-axle



(No Model.)

Q E. P. ROBBINS.

- CARRIAGE AXLE. NO. 413,559. Patented Oct. 22,1889.

WTNESEES. INVENTQFL UNITED STATES PATENT 1 OFFICE.

ELISHA F. ROBBINS, OF-OAMBRIDGE, ASSIGNOR TO THOMAS J. OLYS, OF BOSTON,MASSACHUSETTS.

CARRIAGE-AXLE.

SPECIFICATION forming part of Letters Patent No. 413,559, dated October22, 1889. Application filed December 10, 1888- Serial No. 293,116. (Nomodel.)

To all whom it may concern.-

Be it known that 1, ELISHA F. ROBBINS, of Cambridge, in'the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Carriage- Axles, of which the following is aspecification. This invention relates to carriage-axles the spindles ofwhich are provided with longitudinal anti-friction rollers to run inrolling contact with the axle-box. The invention consists in anaxle-spindle having the main portion, which contains the said roller,made slightly offset from or eccentric to the end portions of thespindle, the extent to which said main portion is offset being equal tothe extent of the projection of the anti-friction roller outside of theperiphcry of the spindle at a point opposite said offset portion, sothat the line of contact of the periphery of the anti-friction roll withthe axle-box will be at the same distance from the axial center of saidbox as a line along the periphery of the spindle at a pointdiametrically opposite to the outer portion of the antifriction roll,while the end portions of the axle are concentric with the axial centerof the box, all of which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification,Figure 1' represents a side View of an axle-spindle embodying myinvention anda sectional view of the box. Fig. 2 represents alongitudinal section of the spindle, the roller being removed. Fig. 3represents a longitudinal section'of the spindle and roller. Fig. 4represents a section on line ,2 .2, Fig. 1. Fig. 5 represents a sectionon line 2' z, Fig. 3.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, or represents the spindle of a carriage-axle, the samebeing composed of the main portion 2, having a longitudinal groove orrecess 1), in which are the bearings b of the anti-friction roll 0, andthe end portions 3 4 at opposite ends of the main portion 2. The portion3 at the inner end is a circular collar or enlargement formed on thespindle and closely fitting a cavity in the inner end of the axle-box gto act both as a stop to limit the inward movement of the box on thethreaded to receive the nut 71., that retains the hub upon the spindle.

In carrying out my lnvention I make the main portion 2 of less than thediameter required to fill the axle-box and offset said porvtion from theend portions 3 4, the main portion being turned on a lathe while runningon a center that is eccentric to the center on which the spindle rotateswhen the portions 3 4 are being turned. In other words, I turn the mainportion 2 on one center and the end portions 3 4 on another center, sothat while the main port-ions 3 4 have the same axial center, the mainportion 2 has a diiferent center and is eccentric to the portions 3 4.The two centers are indicated in Fig. 1 by the dotted lines as w y y andin Fig. 4 by the letters as y.

The roller 0 projects outside of the portion 2 of the spindle, so thatthe lowest part of its periphery, which bears on the box 9, is atthesame distance from the line 00 .r, Fig. 1, as the highest part of theperiphery of the portion 2, said highest and lowest parts bearing on thebox at points diametrically opposite each other, as shown in Figs. 1 and4. It will be seen, therefore, that the described eccentricity of theportion 2 and the projection of the roller 0 therefrom enable theportion 2 and its roller to fit snugly within a box which is concentricwith the end portions 3 4, so that the box willl run easily on all partsof the spindle without binding on any part, and at the same time willfit all parts closely, so that there will be no rattling of the box onthe axle and no admission of dirt between the bearing-surfaces Theshoulder 7;, that connects the portion 2 with the enlargement 3, isbeveled, as shown in Figs. 1 and 3,to increase the strength and preventliability of breakage at this point.

To prevent the roller from dropping out when the box is removed from thespindle, I fit a segmental slide in a groove in the pe riphery of theportion 2, said slide being arranged to extend across one of the reducedportions or journals 0' of the roll 0, as shown in Fig. 5, and therebyhold the roll in place when the hub is removed. By sliding said plateback the roll may be released.

1. An axle-spindle composed of the end sections 3 et and theintermediate section 2, offset from or eccentric to the end sections,and provided with the anti-friction roller 0, which projects from thesection 2, as described, comanti-friction roller in said recess, and thebox which is concentric with the end sections and provided with an innerbeveled shoulder, substantially as set forth.

3. An axle-spindle having a longitudinal recess, a roller c in saidrecess, and a segmental slide fitted in the periphery of the spindle andarranged to retain the roller in its recess, as set forth.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 1st day of December, A. D.1888.

ELISHA F. ROBBINS.

Vtitnesses:

0. F. BROWN, \V. O. RAMSAY.

